Improvement in planing attachments for metal-turning lathes



l A H FF M A N N Planing-Attachment for Metal-Turning L'athes.

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THE GRAPHIC C0.PNOTO LITH.39 8:41 PARK PLAGEl N Y.

NITED STATES PATENT OFFroEo AXEL HOFFMANN, OF NEW YORK, N. Y.

IMPROVEMENT IN PLANING ATTACHMNTS FOR METAL-TURNING LATHES.

Specification forming part of Letters Patent No. 163,657, dated May 25, 1875; application filed March 1, 1875.

To all whom it may concern Be it known that I, AXEL HOFFMANN, ofthe city, county, and State of New York, have invented a new and useful Improvement in tached. Fig. 4 is a side view of the feedspring. Fig. 5 is a side view of the toolholder. Fig. 6 is a face View of the toolholder, looking in the direction indicated by the arrow at Fig. 5. Fig. 7 is a specimen ot` the work performed with this planing attachment.

Similar letters of reference indicate corresponding parts.

A represents the ways of the ordinary engine-lathe for turning metals. B B are the large gear-wheels of the lathe for giving the feed. C is the bed-plate of the attachment, which is made to slide on the ways of the lathe. D is the adjustable clamp, by means of which the attachment is applied to the lathe. E is the lever, by means of which the slide and tool of the attachment is put in motion. F is the fulcrum-pin of this lever. This pin passes through the slotted arm G, which arm is made fast in the slot H of the clamp D. The lever is attached to the bedplate O-by the screw C. I is the feed-screw, which works in the slide J of the tool-holder. K is the tool, which is fastened in the holder L by the set-screw m. N is a spring attached to the base J', which bears against the shank end of the tool. When the tool is on the return movement after making a cut, the holder L is allowed a slight rotary movement on the base J, sucient to relieve the point of the tool. Vhen the tool leaves the piece which it is cutting, the spring throws it back into position for another cut. N is a piece in the lathe, which the tool is'cutting. Thispiece has been turned in the lathe, but is now made stationary for cutting away the surplus metal between the bolt-lugs O O, which work would otherwise have to be done with the chisel and file. The feed of the attachment is given by means of the spring P, which is attached to the bed, as indicated in'dotted lines. On the end of this spring is a lip, Q, which is made to engage with the teeth ofthe gear-wheel B. This spring is operated by hand at every cut of the tool, and the tool and bed are moved the length of each cut by moving the lever back and forth by hand. S S are clamps for holding the tool-holder to the rest by means ofthe screw T. In Fig. 7 is seen another specimen of the work performed in this lathe by means of this attachment. The reamer R was turned in the lathe, and afterward grooved by the attachment, the feed being regulated by changing the gearing according to the feed required. This is an inexpensive arrangement. It is easily applied or removed, and is essentially a labor-saving attachment. The tool-holder L may be turned over so as to work the other way, if desired, in the same manner.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. Areinovable planing attachment for turning-lathes, constructed substantially as described-that is, having a clamp, D, lever E, bed O, tool-holder bed J, spring N, and feedspring P.

2. The arm Gr, in combination with the adjustable clamp D, lever E, bed O, and latheshears A, for the purposes described.

AXEL HOFFMANN. Witnesses:

T. B. MosHER, ALEX. F. ROBERTS. 

